core java interview question part7
Q1 - Three keywords are used in Java to specify access
control. What are they?
A - The three keywords used to specify access control in
Java are public, private, and protected.
Q2 - In Java, special access privileges are afforded to
other members of the same package: True or False? If false, explain your
answer.
A - True. In Java, special access privileges are afforded to
other members of the same package.
Q3 - In Java, class variables are often used with the
__________ keyword to create variables that act like constants.
A - The final keyword.
Q4 - In Java, the ___________ keyword is used to declare a
class variable.
A - The static keyword.
Q5 - In Java, the ___________ keyword is used to declare a
class method.
A - The static keyword.
Q6 - When you include a method in a Java class definition
without use of static keyword, this will
result in objects of that class containing an instance method: True or
False? If false, explain why.
A 7- True.
Q8 - Normally each object contains its own copy of each
instance method: True or False?
A - False, multiple copies of the method do not normally
exist in memory.
Q9- When you invoke an instance method using a specific
object, if that method refers to instance variables of the class, that method
is caused to refer to the specific instance variables of the specific object
for which it was invoked: True or False? If false, explain why.
A - True.
Q10 - Instance methods are invoked in Java using the name of
the object, the colon, and the name of
the method as shown below: True or False? If false, explain why.
myObject:myInstanceMethod( )
A - False. Use the period or dot operator, not the colon.
Q11 - Instance methods have access to both instance
variables and class variables in Java: True or False. If false, explain why.
A - True.
Q12 - Class methods have access to both instance variables
and class variables in Java: True or False. If false, explain why.
A - False. Class method can only access other class members.
Q13 - What are the two most significant characteristics of
class methods?
A - 1. Class methods can only access other class members. 2.
Class methods can be accessed using only the name of the class. An object of
the class is not required to access class methods.
Q14 - In Java, a class method can be invoked using the name
of the class, the colon, and the name of
the method as shown below: True or False? If false, explain why.
MyClass:myClassMethod()
A - False. You must use the period or dot operator, not the
colon.
Q15 - What is meant by overloaded methods?
A - The term overloaded methods means that two or more
methods may have the same name so long as they have different argument lists.
Q16 - If you overload a method name, the compiler determines
at run time, on the basis of the arguments provided to the invocation of the
method, which version of the method to call in that instance: True or False? If
false, explain why.
A - False. The determination is made at compile time.
Q16 - A constructor is a special method which is used to construct
an object. A constructor always has the same name as the class in which it is
defined, and has no return type specified. True or False? If false, explain
why.
A - True.
Q17 - Constructors may be overloaded, so a single class may
have more than one constructor, all of which have the same name, but different
argument lists: True or False. If false, explain why.
A - True
Q18 - What is the purpose of a parameterized constructor?
A - The purpose of a parameterized constructor is to
initialize the instance variables of an object when the object is instantiated.
Q 19 - The same set of instance variables can often be
initialized in more than one way using overloaded constructors: True or False?
If false, explain why.
A - True.
Q20 - It is not necessary
to provide a constructor in Java. True or False? If false, explain why.
A - True. .
Q 21 You can think of the default constructor as a
constructor which doesn't take any parameters: True or False? If false, explain
why.
A - True.
Q 22- In Java, if you provide any constructors, the default
constructor is no longer provided automatically: True or False? If false,
explain why.
A - True.
Q 23- In Java, if you need both a parameterized constructor
and a constructor which doesn't take parameters (often called a default
constructor), you must provide them both: True or False? If false,explain why.
A - True.
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